John Deere
John Deere GP
The John Deere GP was produced from 1928 to 1935 as a row-crop tractor in the Two-Cylinder Letter Series. It was designed as a general purpose tractor with a fixed front axle straddling three rows. Several versions existed including the wide-tread GPWT, the potato field GP-P, and the orchard GPO. The GP featured a two-cylinder kerosene engine available in 5.1L and 5.6L variants, a 3-speed unsynchronized transmission, and was capable of pulling two 14-inch plows. It was built in Waterloo, Iowa, USA, with over 30,000 units produced. The tractor had an open operator station, manual steering, and two-wheel drive.
Power20 hp[B]
Founded1928 - 1935
ModelGP
Technical Specifications
Detailed specifications and technical data for John Deere GP
Power
| Plows | 2 (14-inch) |
|---|---|
| Belt (tested) | 25.36 hp (18.9 kW) |
| Belt (claimed) | 20 hp (14.9 kW) |
| Drawbar (tested) | 18.86 hp (14.1 kW) |
| Drawbar (claimed) | 10 hp (7.5 kW) |
Tires
| Rear tire | 42.75x10 steel, 10.00x32 |
|---|---|
| Front tire | 24x6 steel, 6.00x16 |
Engine
| Aux. fuel | 2 gal (7.6 L) |
|---|---|
| Fuel tank | 16 gal (60.6 L) |
| Details 5.1L | John Deere kerosene 2-cylinder liquid-cooled inline. Original engine, used until 1931. Water-injection system was used to prevent detonation ("knocking") with low quality fuels. |
| Details 5.6L | John Deere kerosene 2-cylinder liquid-cooled. The new engine was introduced in 1931 on GP serial number 224100. It had lower compression but with a quarter-inch larger bore, producing slightly more power with better fuel economy. The lower compression eliminated the pre-ignition problem when using low-quality fuel, so the water-injection system was eliminated. |
| Engine options | John Deere 5.1L 2-cyl kerosene, John Deere 5.6L 2-cyl kerosene |
| Rated RPM 5.1L | 900 |
| Rated RPM 5.6L | 950 |
| Bore/Stroke 5.1L | 5.75x6.00 inches (146 x 152 mm) |
| Bore/Stroke 5.6L | 6.00x6.00 inches (152 x 152 mm) |
| Displacement 5.1L | 311.6 ci (5.1 L) |
| Displacement 5.6L | 339.3 ci (5.6 L) |
| Coolant capacity 5.1L | 36 qts (34.1 L) |
| Coolant capacity 5.6L | 36 qts (34.1 L) |
Variants
| GPO | orchard |
|---|---|
| GP-P | potato |
| GPWT | wide-tread |
Dimensions
| Height | 55.5 inches (140 cm) |
|---|---|
| Length | 112 inches (284 cm) |
| Weight | 3,600 lbs (1632 kg) |
Mechanical
| Drive | Two-wheel drive |
|---|---|
| Steering | Manual steering |
| Operator station | Open operator station |
Production
| Built in | Waterloo, Iowa, USA |
|---|---|
| Description | The GP was originally designated the Model C, the name was changed due to a similarity to the existing D, plus the "General Purpose" name was a marketing ploy to keep in line with International's new "Farmall". The GP was designed as a row crop tractor, with the fixed front axle straddling three rows. Several versions of the GP were made. The "wide tread" GPWT has a 76-inch rear axle and a tricycle front. The GP-P was a modified GPWT with a 68-inch rear axle, for use in potato fields. The GPO was lowered and had fenders for orchard work. Twenty-four GPO tractors were converted into crawlers by Lindeman. |
| Total built | 30,535 (GP), 5,103 (GPWT), 717 (GPO) |
| Manufacturer | John Deere |
| Original price | $1,200 in 1935 |
Transmission
| Type | unsynchronized gear |
|---|---|
| Gears | 3 forward and 1 reverse |
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